diff --git a/compiler/rustc_expand/src/base.rs b/compiler/rustc_expand/src/base.rs
index b630bc1f4732f..9bef8227275af 100644
--- a/compiler/rustc_expand/src/base.rs
+++ b/compiler/rustc_expand/src/base.rs
@@ -1011,6 +1011,7 @@ impl<'a> ExtCtxt<'a> {
     pub fn source_map(&self) -> &'a SourceMap {
         self.sess.parse_sess.source_map()
     }
+    #[inline]
     pub fn parse_sess(&self) -> &'a ParseSess {
         &self.sess.parse_sess
     }
diff --git a/compiler/rustc_expand/src/proc_macro_server.rs b/compiler/rustc_expand/src/proc_macro_server.rs
index fa9e98be9e881..5a9b9bc86240b 100644
--- a/compiler/rustc_expand/src/proc_macro_server.rs
+++ b/compiler/rustc_expand/src/proc_macro_server.rs
@@ -377,6 +377,7 @@ impl<'a, 'b> Rustc<'a, 'b> {
         }
     }
 
+    #[inline]
     fn sess(&self) -> &ParseSess {
         self.ecx.parse_sess()
     }